I had a torn ACL and three years later my knee is popping. What up?

There are a few reasons why your knee might be popping three years after an ACL tear.

* Scar tissue. ACL injuries often result in scar tissue formation, which can cause the knee to feel stiff or unstable. Scar tissue can also cause the knee to pop or click when you move it.

* Meniscus damage. The meniscus is a piece of cartilage that helps to cushion the knee. Meniscus damage can occur during an ACL injury, or it can develop over time. Meniscus damage can also cause the knee to pop or click.

* Patellofemoral pain syndrome (PFPS). PFPS is a condition that causes pain in the front of the knee. PFPS can be caused by a variety of factors, including ACL injuries, meniscus damage, and osteoarthritis. PFPS can also cause the knee to pop or click.

* Osteoarthritis. Osteoarthritis is a condition that causes the cartilage in the knee to wear away. Osteoarthritis can develop after an ACL injury, or it can occur due to other factors, such as aging or obesity. Osteoarthritis can cause the knee to pop or click.

If you are experiencing popping in your knee, it is important to see a doctor to get an accurate diagnosis. The doctor may order imaging tests, such as an MRI or X-ray, to determine the cause of the popping. Once the cause of the popping has been determined, the doctor can recommend the appropriate treatment.

Here are some tips for managing knee popping:

* Rest your knee. Avoid activities that aggravate your knee pain or popping.

* Ice your knee. Applying ice to your knee can help to reduce swelling and pain.

* Elevate your knee. Elevating your knee can help to reduce swelling and pain.

* Use a knee brace. A knee brace can help to support your knee and reduce pain.

* Strengthen your knee muscles. Strengthening your knee muscles can help to improve stability and reduce pain.

* See a doctor. If your knee popping is severe or does not improve with home treatment, see a doctor.